FILE - This combination of two file photos shows U.S. President Donald Trump, left, speaking in the State Dining Room of the White House, in Washington on Feb. 26, 2018, and North Korean leader Kim Jong Un attending in the party congress in Pyongyang, North Korea on May 9, 2016. With just weeks to go before it's all supposed to happen, there's still no official word on where U.S. President Donald Trump and North Korean leader Kim Jong Un will hold their first-ever summit. (AP Photo/Evan Vucci, Wong Maye-E, File)(Evan Vucci Wong Maye-E)

U.S. Sens. Elizabeth Warren and Ed Markey, called on chamber leaders this week to ensure the Trump administration keeps Congress informed of its negotiations with North Korea ahead of an expected summit between the country's two leaders.

The Massachusetts Democrats, who joined more than two dozen of their colleagues in signing an April 30 letter, urged Senate Majority Leader Mitch McConnell, Minority Leader Chuck Schumer and Senate Foreign Relations Committee leaders to request a briefing on the White House's negotiation strategy.

Arguing that Congress has played an important role in shaping the United States' North Korea policy -- including authoring various sanctions against the country -- the senators further called for Senate leaders to press the administration for monthly briefings so lawmakers can remain fully informed as negotiations move forward.

The senators, who noted that they "strongly support a diplomatic solution to freeze and ultimately denuclearize the Korean Peninsula," contended that communication between the White House and Congress is needed as the Trump administration engages in such talks.

They added that "there is recent historical precedent for the White House keeping Congress consistently informed during delicate international negotiations," pointing to briefings the Obama administration routinely held with lawmakers on Iran.

"We believe the Trump administration should commit to this level of engagement with Congress for the duration of its talks with North Korea. ... Congress must remain well-informed throughout any talks with the Kim regime, particularly if an agreement requires the removal of sanctions as an inducement to North Korea taking steps toward denuclearization," they wrote.

The senators, in asking the White House to commit to "a sustained engagement with Congress" during and after the expected summit between President Donald Trump and North Korean Leader Kim Jong Un, argued that "the more the White House engages with Congress on its progress in negotiations, the more effective partner that Congress can be to support a peaceful resolution to this crisis."